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    SubjectCIFS kernel module bug

    Looking at the current kernel (in Linus' repository on github) there is a silly logic bug in the cifs module in fs/cifs/cifsfs.c::cifs_llseek() there is this bit of code:

    * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
    * the cached file length
    if (origin != SEEK_SET || origin != SEEK_CUR) {

    The logical or should be a logical and, i.e. this should be:

    if (origin != SEEK_SET && origin != SEEK_CUR) {

    As the code is at present that line is ALWAYS true because origin is ALWAYS either != SEEK_SET or != SEEK_CUR as if it equals one it cannot equal the other and vice versa…

    So at the moment it always does the revalidation instead of only for SEEK_END, SEEK_DATA, and SEEK_HOLE.

    Best regards,

    Anton Altaparmakov <aia21 at> (replace at with @)
    Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
    Linux NTFS maintainer,

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      Last update: 2011-09-30 16:01    [W:0.021 / U:61.580 seconds]
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